GENEVA, Dec. 28 -- BEIJING GRAND HITEK.CO., LTD. (Room 01, 1st To 2nd Floor, Building 1, No. 1 Kechuang 15th Street, Beijing Economic-Technological Development Area, Daxing DistrictBeijing 100176), 北京通嘉宏瑞科技有限公司 (中国北京市大兴区北京经济技术开发区科创十五街1号1幢1至2层01) filed a patent application (PCT/CN2025/098345) for "ROOTS VACUUM PUMP HOUSING, ROOTS VACUUM PUMP AND WORKING METHOD THEREFOR" on May 30, 2025. With publication no. WO/2025/261134, the details related to the patent application was publishe...